/* ======================全局CSS样式====================== */
html,body,ul,li,p{
	margin: 0;
	padding: 0;
}
html,body{
    width: 100%;
}
ul{
	list-style: none;
}
a{
    color: #000;
	text-decoration: none;
}
.icon {
    width: 1em;
    height: 1em;
    vertical-align: -0.15em;
    fill: currentColor;
    overflow: hidden;
}
img{
    border: none;
    display: block;
}



/* ======================header部分====================== */
header{
    height: 12vw;
}

/* ======================上导航条====================== */
.top_nav {
    background-color: #FFF;
    width: 100%;
    overflow: hidden;
    height: 12vw;
    position: fixed;
    top: 0;
    left: 0;
}
.top_nav .search{
    width: 100%;
    height: 12vw;
    background-color: #F2F2F2;
    display: flex;
    align-items: center;
}
.top_nav .search .retu{
    margin-left: 4vw;
    font-size: 8vw;
    line-height: 12vw;
    display: flex;
    justify-content: center;
    align-items: center;
    
}
.top_nav .search .box{
    flex-grow: 1;/* 填满 */
    height: 8vw;
    background-color: #F2F2F2;
    display: flex;
    align-items: center;
    box-sizing: border-box;
    border: solid .1vw #a4a4a4;
    border-radius: 4vw;
    overflow: hidden;
}

.top_nav .search .box input{
    width: 100%;
    border: none;
    background-color: #F2F2F2;
    outline: none;/* 控制聚焦时不出现边框 */
    overflow: hidden;
    margin-right: 2vw;
    font-size: 4vw;
}

.top_nav .search .box .icon{
    font-size: 7vw;
    margin: 0 1.4vw;
}
.top_nav .schbtn{
    display: flex;
    text-align: center;
    font-size: 4vw;
    margin: 0 2vw;
    font-weight: bold;
    letter-spacing: 1vw;
    color: #000;
    border: none;
}





/* ======================内容部分====================== */
section{
    width: 100%;
}


.history{
    margin: 0 4vw;

}
.ht{
    display: flex;
}
.ht>h3{
    font-size: 6vw;
    color: #000;
    flex-grow: 1;
}
.history ul{
    display: flex;
    flex-wrap: wrap;
}
.history li{
    width: 50%;
    box-sizing: border-box;/* width=content+padding+border */
    font-size: 4vw;
    color: #000;
    padding: 0 5vw;
    margin-top: 2vw;
    height: 6vw;
    line-height: 6vw;
    overflow: hidden;/* 溢出隐藏 */
    text-overflow: ellipsis;
    white-space: nowrap;
}
.history li a{
    color: #4f4f4f;
}
